Rotary pump



Aug. 23 1927.

Filed Nov. 13. y1926 H. A. VVITTEMAN ROTARY PUMP' 2 sheets-snm 1 ATTORNEY Aug. 23 1927.

f 1,640,169 H. A. WITTEMAN ROTARY PUMP Filed Nov. 13. 1926 2 Sheets-Sheet 2 es *'1 T25. bw/@AWM BY Y MONEY Patented Aug. 23, 1927.

UNITED` STATES PATENT OFFICE;

normar rum?.

Yapplicati@man1am-.mbar 1s, 192e.` serial' m. 148,127.

This invention` relates to rotary pumps andi's inV the'natu-re'of' animprovement on the pump illustrated and described in patent' appli'eationSer. No.V 52,734 filed by me Augusti27, 1925.l

Y Theobj'ect `of the present` invention is the perfectinglof aA pumpofA this character to renderthe sameY more eiricient and" better ada ted-for heavy du-ty'worlr.

ore` specific objects and advantages of the invention willI appear` inthe following description. n

The inventionv4 consists inI certain novel features of construction and inthe adaptaL tionand combination` ofZ the same as will be hereinafter described andclaimed.'

In the accompanying drawings,-

' Figure 1 isa view partly in side elevation and partly in longtudinalfvertical section ofl a rotary. pumpk embodying my improvementi; Figs; 2 and glare transverse sectional views taken substantially onr lines 2-2' and `3)--3 of Fig. 1; Fig. 4 is an end elevation of tlie'pump, including-supply and exhaust pipe connections whichl are sh'ownin trans'- verse section and: Fig. '5' is a detail sec'- tional View. o'n broken lines, 5-5 of Fig. 3.V

In carrying outrmy invention I Vemploy ai: casing' composed of companion members 10v and 11 which are secured together' as by means lof'boltsf'12.y v Said *casing is formed to'prov-ide between itsend wallsfouter land inner peripheral wafllslfl andY 13 to afford an annularfspace which isprefera'bly rectangular in transverse section, and disposed concentri'callyfofr` ashaftfl which carries thev rotor.l Thel inner peripheral wall ele'- ments 13 of the respective members are sep-l aratedafshortdistance apart to receive be-I tween-'them the disklelement lioffthe rotor which is rigid upon the shaftyl. Said disk is-circular with ak diameter to have it con`` tact circumferentiallyv with the outer pe riphery 18ct' said an'nularjspace, thereby separating the ,latter into two rectangular pumping-chambers l9fand 20 "of equal 'trans-Y verse sections.. 'i

eter of the same are radially disposed" pistons 21, three being shownA in. the drawings, said Vpistons ,beingv rectangular* in outline and f adapted to rcvolubly l fit the respective- 'Provi ed; in said'icasing is. cylindrical Rigide@ Smid-isi( and Within the' perm-.

chamber which is divided into'V two abutment receivingY chambers 23 by means of'a partition; 24' which is locatedv in the plane ofthe' rotor' diskllf?. The axis of the chambers Y23@ism-ranged parallel with the axis fof the shaft 16 and is spaced therefrom so that the chambers 23will extend as a reentrantf cavitydenoted by 25 in Fig; 3- withinithe produced circle circumscribed by the' inner periphery 2610i' the pumping chambers`f19`and 20.

The partition 24- is of' a; substantially lunar` shape, see Fig. 2, having a diameter equaltothe diameter lof the chambers 23, the concave peri heral surface V27 of said partition being o a curvature and arranged to itthe periphery of thefdisk- 17.

Positioned within each lof the chambers 23, is` a hollow cylindrical' abutment 28 which isprovidedin its peripheral'wall and in its side wall at diametric'all"1 opposite sides of its axis of rotation witlifopenin'gs 29V to ac'fcommodatev the pump fpistons Y 21 in tlieirhrevoluble travel when 'traversing the abutment chambers. c A f Said abutments are-rigid-vwith afshaftf() which Ais operatively connected Y Vto .the rotor shaft'v 16 by means of. spurfgears 31 and 32 Y mounted upon1 the' respective shafts; said gears being'- proportioned yfor transmitting suitable rotary motion from' onel shaft to the other to cause 'the abutment openings andy pstonsto register-fin proper sequence one withlltheother;` A, c

lVater or other liquid which istoY be pumpedK is admitted andldischarged? atl op-vA posite sides' offthe abutments into andfkro'm the pumping chambers 19fandl 20,' asindicated by arrows A and B when the rotor turns linthe direction indicated by arrow C in Fig, 3; As illustrated,v cavities 33and 345A providedy withinv the casing rafford corn-V munieation between. inlet'and discharge-cony nections 331 and 341, respectively, and=ports 35 and 36 which open into the pumping y,

chambers "19 and 20 andalso into the abutp ment chambers23 at Vthe intake and exhaust; sides of'the pump,r r f I kTo facilitate the; flow or circulation of water vabo'utrthe pistons `21 during their 'pas-y sage by the-ports 36- and 'finto a'ndfrom the-pistonreceiving openings'in the 'abutments, I' provide recesses''? and 38'in theVV K end wallsof` the casing.- Theserecesses,=as i shown, include w ll areas which extend into cavities 34 and 83, the pumping chambers 19-20 and the abutment chambers 23. The lengths of the wall recesses radially of the shaft 16 is somewhat greater than that of the pistons in the same direction.

The peripheral walls of the abutments and also the end walls thereof between the piston-receiving openings are so arranged that the abutments will serve as rotary valves to open and close communication between the interiors of the abutments and the respective ports and 36 and recesses $7- Sv to prevent any directflow of water through the abutment vchambers between said ports; the pistons as they successively enter the abutments displacing therefrom waterv which has been supplied from the pumping chambers in proximity to thedischarge port 3G. r1`he water pressure between the interiors of the two abutments is equalized by the provision of a passage 39 inthe partition 24 and also bythe provision of recesses 4()V in the peripheral wall of the abutment chambers, which recesses are communicatively connected through the medium Vof the piston receiving openings in the abutments twice in each rotation of the latter'.

As illustrated in F ig. ,1, a cover member 41 is advantageously secured to the casing member 11 to serve therewith as a housing for the gears 31 and 32. l

vThe shafts 16 and 30, as shown, areeXt-ended through both the pump casing and the gear housing and are journaled in ball bearing assemblies, as 42, provided in the end wall of the casing member l and the housing cover member 41, respectively. These ball bearing assemblies are disposed upon the respective shafts against the glands 43 of stuffing bores for the shafts and serveas media for setting the glands, from bridge bars 44 which are regulated by take-up screw bolts 45 engaging in threaded holes provided in the casing and gear housing ends.

In operation, power applied to the shaft 16 drives the' rotor and also, through the medium ofthe gears 31 and 32, rotate the abutments 28. y

When the rotor and abutments are thus driven the pistons'Ql successively revolve in t-he lrespective abutment openings'through the abutment chambers 23. After a piston has passed the abutments and the water intake 33 it creates a suctionto its rear to draw the fluid into the pumping' chambers, which water accompanies thepistonuntil the latter has passed the pumps discharge opening 34, whereupon the water drawn by the referred to piston is forced bythe following piston through-the discharge opening 34. In each cycle of operation theabutments 28 are rotated to present thepistonreceiving openings thereof in positions to receive the pistons. The outer peripheral portion of the disk 17 passes between the abutments which latter overlaps said disk.

While I have described the invention as pertaining to a pump it may also be advantageously used as a fluid pressure motor. For such use the rotor is rotated by the power medium to drive the shaft 16.

Vhat I claim, is,-

1. In apparatus of the character described, annular pumping chambers having circumferentially spaced apart inlet and discharge ports, a rotor comprisinga disk and a plurality of pistons revoluble in said chambers, hollow rotary members extending into said chambers to close the same at opposite sides of the rotor-disk between said ports, said members being provided at diametrically opposite sides with openings to successively receive the rotor pistons, said openings having communication with each other through the medium of the chambers within the respective hollow members, shafts for the rotor and said members, and operative driving connections between said shafts.

2. In apparatus as definedin claim 1, .wherein the rotary members are disposed in spaced apart relation, 'a non-rotatable partition disposed in the plane of the rotor disk and between said rotary members, said partition being provided with a passage way to afford communication between all of the piston receiving openings of both rotary members. i

3. In apparatus as defined in claims 1 wherein recesses are provided Vin the end walls of the pumping chamber and com municating-with the respective ports to permit the circulation of waters about the pis-V tons as they approach and leave the openings therefor' in the rotary members. l

4. A rotaryl pump, having a casingkprovided Awith two pumping chambers, and abutment chambers intersecting the zpumping chambers, said casing being provided with spaced apart inlet andv outlet openings, recesses `provided in the casing walls and serving to communicatively connect the pumping chambers with the abutmentchambers at their inlet and outlet sides, a rotor comprising a disk, pist-ons rigid with the disk and located within the perimeter thereof,v said pistons'being revoluble within the pumping chambers and a portion ofthe abutment chambers, abutments rotating within the respective abutment chambers and overlapping the rotor disk, a driving shaft car,- rying the rotor, a shaft carrying saidabutments, and gearl connections between said shafts.

5. rotary pump, having pumping chambers,'with recesses in the end walls thereof, a rotor having pistons revoluble inqsaid pumping chambers, an abutment. chamber connnunicatively connected by means of said recesses with the respective pumping chamabutment having closed ends between said bers, an abutment divided into two compartpockets thus affording a valve with respect ments by apartition and provided with opento said recesses as the rotor pistons succes- 10 ings or pockets diametrically opposite each sively enter and emerge from the abutments.

5 other aii'ording communication between the Signed at Seattle, Washington, this 18th pumping chambers and the recesses at oppoday of October, 1926. site sides of the abutment chamber, said HARVEY A. WITTEMAN.- 

